Gemini-BPM250-mix-sm维修电路原理图.pdf

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1、Page 1SERVICE MANUALBPM-250Stereo Preamp MixerCONTENTS:Connections & Operations:.Page 2-5Specifications:.Page 5Parts Lists:.Page 5PCBs:.Page 6-7Schematics.Page 8Gemini Sound Products Corp.120 Clover Place P.O. Box 6928Edison, NJ 08818-6928732-738-9003 (Phone) 732-738-9006 (Fax)RadioFans.CN 收音机爱 好者资料

2、库Page 23191314154252324262827511829202121217688761617678999221211102RadioFans.CN 收音机爱 好者资料库Page 33038383939404034343333323231313636353738GROUND LIFTLIFTPage 4Connections1. Before plugging in the power cord, make sure that the VOLTAGESELECTOR (30) switch is set to the correct voltage.NOTENOTENOTENOTE

3、NOTE: This product is double insulated and not intendedto be grounded.2. Make sure that the POWER (1) switch is in the off position. ThePOWER LED (2) will be off.3. The BPM-250 is supplied with 3 sets of output jacks. The MASTEROUTPUT (38) jacks are used to connect to your main amplifier. TheOUTPUT

4、REC (40) jacks can be used to connect the mixer to therecord input of your recorder enabling you to record your mix. TheOUTPUT BOOTH (39) jacks allow you to hook up an additionalamplifier.4. The DJ MIC (3) input (found on the front panel) accepts a 1/4 orXLR connector and accepts only unbalanced mic

5、rophones.5. On the rear panel are 2 stereo PHONO (32, 34) inputs, 2 stereoLINE (31, 33) inputs and 1 stereo PHONO/LINE (36) input. ThePHONO/LINE (35) switch enables you to set the (36) input to Phonoor Line. The phono inputs will accept only turntables with a magneticcartridge. A GROUND (37) screw f

6、or you to ground your turntablesis located on the rear panel. The stereo line inputs will accept anyline level input such as a CD player, a cassette player, etc.6. Headphones can be plugged into the front panel mountedHEADPHONE (4) jack.7. The BPM-250 comes with a front panel BNC LIGHT (5) jack. Thi

7、sjack is for use with a gooseneck light like the Gemini GNL-700.Using the Ground Lift SwitchDepending on your system configuration, sometimes applying theground will create a quieter signal path. Sometimes lifting the groundcan eliminate ground loops and hum to create a quieter signal path.1. With t

8、he mixer on, listen to the system in idle mode (no signalpresent) with the ground applied (the GROUND LIFT SWITCH (38)in the left position).2. Then turn the power off before moving the GROUND LIFTSWITCH (38). Lift the ground by moving the GROUND LIFT SWITCHto the right, turn the power back on and li

9、sten to determine whichposition will provide a signal devoid of background noise and hum.Keep the GROUND LIFT SWITCH in the ground position if the noiselevel remains the same in either position.CAUTION: DO NOT TERMINATE THE AC GROUND ON THE POWERMIXER IN ANY WAY. TERMINATION OF THE AC GROUND CAN BEH

10、AZARDOUS.Operation1. POWER ON: Once you have made all the equipment connections toyour mixer, press the POWER SWITCH (1). The power will turn onand the POWER LED (2) will glow RED.2. CHANNEL 1: The GAIN (6), HIGH (7), MID (8), and LOW (9),controls allows you to fully adjust the selected source. Swit

11、ch #(10) allows you to select either the DJ MIC (3) or the PHONO/LINE(36) input. The CHANNEL (13) slide controls the output level of thischannel.3. MAIN CHANNEL SECTION: To assign an input source to a channel,first set the PHONO/LINE (11,12) switches to their appropriatepositions. To make the proper

12、 adjustments to your music, set theGAIN (6), HIGH (7), MID (8) and LOW (9) controls and position theCHANNEL (14, 15) slide.NONONONONOTETETETETE: There is Low, Mid and High equalization for eachchannel with an extremely wide range of adjustmentgiving you a smoother mix.SUGGESTION: You can use the Cut

13、 Features on each channel toremove Low, Mid and/or High to create special effects.4. CROSSFADER SECTION: The CROSSFADER (26) allows the mixingof one source into another. The left side of the CROSSFADER (26) ischannel 2 and the right side is channel 3. The CROSSFADER (26) inyour unit is removable and

14、 if the need arises can be easily replaced.Crossfader units are available in three varieties. Part # RF-45 (whichis identical to the crossfader supplied with the mixer) has a 45 mmtravel from side to side. Part # RF-30 is available with a 30 mm traveldistance. Also available is the PSF-45 with a spe

15、cial curve designedfor scratch mixing. Just purchase one of these crossfader unitsfrom your Gemini dealer and follow these instructions:1. Unscrew the outside FADER PLATE SCREWS (B). Do nottouch the INSIDE SCREWS (C).2. Carefully lift the fader and unplug the CABLE (D).3. Plug the new fader into the

16、 cable and place it back in themixer.4. Screw the fader to the mixer.5. BPM DISPLAY: There are BPM DISPLAYS (23, 24) for Channel 2 andChannel 3. They update approximately every beat and digitallydisplay the Beats Per Minute allowing you to match the beatsvisually. BPM DISPLAY (23) reflects the Beats

17、 Per Minute ofChannel 2, and BPM DISPLAY (24) reflects the Beats Per Minute ofChannel 3.NONONONONOTETETETETE: A - - reading will appear on the BPM DISPLAY ifthe track has unclear beats. The - - reading will alsoappear if there is no signal present.6. The BEAT OFFSET INDICATORS (25) light when the tr

18、acks ofChannel 2 and Channel 3 are within 11 BPMs of each other anddisplay how aligned the beats for Channel 2 and Channel 3 are.When the RED LEDs light, the beats are not aligned. When theYELLOW LEDs light, the beats are almost aligned. When the GREENLED lights, the beats are aligned perfectly.NOTE

19、NOTENOTENOTENOTE: If the diffence between the two channels beatsexceed 11 BPM, the BEAT OFFSET INDICATORS will notlight.SUGGESTION: You can use the BPM DISPLAYS to determinewhich tracks have similar or the same Beats Per Minute. Whenmixing two tracks with similar Beats Per Minute, you can useone sou

20、rces pitch control to align the Beats Per Minute withthe other sources BPM. The BPM DISPLAYS and the BEATOFFSET INDICATORS update every beat and will reflect thechange in BPM and indicate when the beats are aligned.NOTENOTENOTENOTENOTE: Beat mixing is a skill that requires practice. Notevery track h

21、as a strong beat, and beat mixing worksbest with tracks with clear and strong beats.7. OUTPUT CONTROL SECTION: The level of the MASTER OUT (38) iscontrolled by the MASTER (18) control. The BALANCE (17) controlwill allow the Amp Out signal to be balanced between the left andright speakers. The BOOTH

22、(16) control adjusts the level of theBOOTH OUTPUT (39). HINT: The booth OUTPUT is used by someDJs to run monitor speakers in their DJ booth. You can also use it asa second ZONE or AMP output.Page 5NOTENOTENOTENOTENOTE: The RECORD OUT (40) RECORD OUT (40) RECORD OUT (40) RECORD OUT (40) RECORD OUT (4

23、0) has no level control.The level is set by the channel slides and the gaincontrols of the selected channel. The tonal qualities areset by the bass, treble and mid controls of that samechannel.8. TALKOVER SECTION: The purpose of the talkover section is to allowthe program playing to be muted so that

24、 the mic can be heard abovethe music. When the TALKOVER (19) button is pushed, theTALKOVER INDICATOR will glow and the volume of all sourcesexcept the Mic or whatever is connected to the PHONO/LINE (36)input are reduced by -16 dB.9. CUE SECTION: By connecting a set of headphones to theHEADPHONE (4)

25、jack, you can monitor any or all of the channels.Select the correct CUE (21) button or buttons and their respectiveCUE LED (29) indicators will glow. Use the CUE LEVEL (20) controlto adjust the headphone volume without effecting the overall mix. Bysliding the CUE PGM PAN (22) control to the left you

26、 will be able tomonitor the assigned cue signal. Sliding to the right will monitor thePGM (program) output.10.DISPLAY: The peak hold, dual function DISPLAY (27) indicates eitherthe MASTER (38) output left and right levels or the channel 2 andchannel 3 levels. You can choose the option you want by pr

27、essingthe DISPLAY (28) button.NONONONONOTETETETETE: When the DISPLADISPLADISPLADISPLADISPLAY (27)Y (27)Y (27)Y (27)Y (27) is in the channel 2/channel 3 display mode, by adjusting the individualchannel gain and tone controls, you can increase ordecrease the signal to match the other channels signal.T

28、he channel slides and crossfader have no effect on thedisplay readings.SpecificationsINPUTS:DJ Mic.1.5mV 2Kohm unbalancedPhono.3mV 47KohmLine.150 mV 27KohmOUTPUTS:Amp/Booth.0 dB 775mV 400ohm Max.24V Peak to PeakRec.225mV 5KohmGENERAL:Low.+ 12/-26dBMid.+ 12/-26dBHigh.+ 12/-26dBGain (Mic).0 to -40dBGa

29、in (Chnls 1-3).0 to -20dBFrequency Response.20Hz - 20KHz +/- 2dBDistortion.0.02%S/N Ratio.better than 80dBTalkover Attenuation.-16dBHeadphone Impedance.16ohmPower Source.115/230V 50/60Hz 15WDimensions.254mm x 305mm x 112mm 10 x 12 x 4 7/16Weight.6.5 lbs (3 Kg)DescriptionPart #Cabinet Parts and Packi

30、ng123456789101112131415161718192021222324252627282930313233343536373839404142434445Item #Parts Lists002-194A021-758B021-969B032-019022-360023-674002-531002-532002-713002-714003-131148-236148-238148-239003-970003-362003-372003-989A003-993003-969003-711022-305049-206146-710159-167159-171159-216159-201

31、047-468046-024003-548003-510003-612190-062102-007102-025121-003A111-051A111-046A111-044A110-172A111-043A111-049A131-081107-015PANEL CONTROLBRACKET VRPANEL REARCOVER BOTTOMHOLDER X-FADERSWING LEVEL (LONG)KNOB PUSH (SMALL)BUSHING FOR KNOB (SMALL)KNOB SLIDE (BIG)KNOB SLIDE (SMALL)KNOB ROTARY (B)KNOB IN

32、LAY (BLACK); BOOTH,BAL,MASTER,CUEKNOB INLAY (RED); GAINKNOB INLAY (GRAY); HIGH,MID,LOWVR INLAYPLATE LEDPLATE DISPLAY (SMALL)HOLDER LEDHOLDER BUSHING LEDHOLDER LED 3f (17mm)HOLDER LED 3f (7mm)PROTECTOR PLATE FOR 115/230V SWITCHPAD FOOTGND SCREWVR DUST PROOF CLOTH (SMALL)VR DUST PROOF CLOTHSWING DUST

33、PROOF CLOTHBNC DUST PROOF CLOTHPCB SUPPORTSCREENSPACEREVA PADSNAP RIVETDRYERPAN-HEAD MACHINE SCREW; PMS 2X4(B)PAN-HEAD MACHINE SCREW; PMS 2.6X4(B)BAND-HEAD TAPPING SCREW/TW-E; BTB-3/TW-3 3X6(AB)BAND-HEAD TAPPING SCREW; BTS-3 3X5(AB)BAND-HEAD TAPPING SCREW; BTS-3 3X6(AB)BAND-HEAD TAPPING SCREW; BTS-3

34、 3X10(AB)BAND-HEAD TAPPING SCREW/TWIN SCREW; BTS-2 3X8(AB) TWINFLAT-HEAD TAPPING SCREW; FTS-3 3X6(AB)FLAT-HEAD TAPPING SCREW; FTS-3 3X12(AB)NUT/WASHER 3mmBAND-HEAD MACHINE SCREW; BMS 3X2X4162-823162-975162-978162-979162-980PRINTED CIRCUIT BOARD PC626-1; IN/OUTPRINTED CIRCUIT BOARD BPM250-2; (94V0 20

35、3.5241.5mm)PRINTED CIRCUIT BOARD BPM250-5; LINE/PHONOPRINTED CIRCUIT BOARD BPM250-7; BITPRINTED CIRCUIT BOARD BPM250-8; BIT DISPLAY (CEM-1 41166mm)DescriptionPart #Printed Circuit BoardsItem #12345Page 6Parts Lists - PCB1 Input/Output079-003161-105SILICON DIODE 1N41484P RCA JACKA104, A105A1, A2, A3,

36、 A4DesignatorsDescriptionPart #Electrical PartsItem #12076-095076-104TRANSISTOR 2SC2878TRANSISTOR 2SA1048 (2SA1317)A80, A84, A96, A76A21, A51, A119DesignatorsDescriptionPart #TransistorsItem #12074-104INTEGRATED CIRCUIT NJM4558LA21, A51, A119DesignatorsDescriptionPart #ICsItem #1Parts Lists - PCB2 M

37、ain076-094079-025082-019083-069083-097083-076081-004072-091072-097071-103071-084071-136071-145092-078092-090080-091080-090080-077080-076080-075TRANSISTOR DTC114TSZENER DIODE 1/2 W 10VLEVER SWITCH 4P2CPUSH SWITCH 2P2C L=12.5PUSH SWITCH 4P2C L=12.53KEY PUSH SWITCH 2P2C L=12.5 P=15mmSLIDE SWITCHSLIDE V

38、R 45mm L=20 10KA2SLIDE VR 30mm L=15 10KB2ROTARY VR 16f L=20 50KB2ROTARY VR 16f L=20 50KA2ROTARY VR 16f L=20 20KMN2 C.CROTARY VR 16f L=20 50KE2 C.CPHONE JACK 6.3fPHONE JACK 6.3f+ XLRLIGHT EMITTING DIODE (RED) 3.15fLIGHT EMITTING DIODE (GREEN) 55LIGHT EMITTING DIODE (GREEN) 2.55LIGHT EMITTING DIODE (Y

39、ELLOW) 2.55LIGHT EMITTING DIODE (RED) 2.55Q301, Q401, Q501, Q601D902SW102, SW302, SW502SW401SW601SW501-503SW101VR310-312VR501VR201-203VR402, VR404 VR502VR403VR301-303PJ1J101Red 3.15Green 5x5Green 2.5x6.5Yellow 2.5x6.5Red 2.5x6.5DesignatorsDescriptionPart #Electrical PartsItem #1234567891011121314151

40、617181920074-104074-113074-111INTEGRATED CIRCUIT NJM4558LINTEGRATED CIRCUIT NJM4556LINTEGRATED CIRCUIT LB1412IC201-204,IC301-303,IC401-404, IC501IC502IC601-602DesignatorsDescriptionPart #ICsItem #123PCB2 - Main Page 7PCB1 - Input/OutputPage 6IC101A4558LC105222C106822R10436KR105470KR102820R106100R103

41、47KR107220KR114220KC10322/25C10447/16C10747/16C112822C111222R112470KR11136KR113100C11447/16C11347/16IC101B4558LC102100PC109100PR11047KR109820C11022/25R1012K2R1082K2C1014.7/25C1084.7/25L.CHR.CHIC102A4558LC118822C119223R1188K2R119100KR116180R11747KR1212K2R1272K2C11647/16C11747/16C123223C122822R126100K

42、R1258K2R128100C12447/16IC102B4558LC115100PC120100PR12447KR123180C12147/16R1151KR1221KL.CHR.CHR120100C125100PC126100PR1292K2R1302K2R.CHL.CHIC103A4558LC130822C131223R1348K2R135100KR132180R13347KR1372K2R1432K2C12847/16C12947/16C136223C135822R142100KR1418K2R144100C13447/16IC103B4558LC127100PC132100PR140

43、47KR139180C13347/16R1311KR1381KL.CHR.CHR136100C137100PC138100PR1452K2R1462K2R.CHL.CHR14747KR15247KR149220R153220C14010/25C13910/25Q1012SC2878Q1022SC2878R1514K7R1554K7R150220R156220R14868KR15468KR.CHL.CHR15747KR16147KR158220R162220C14210/25C14110/25Q1032SC2878Q104 2SC2878R1604K7R1634K7R159220R164220R

44、.CHL.CHR1651KR1661KR.CHL.CHQ105DCT124TSC1434.7/25C144220/16R167680KD101IN4148D102IN4148SW101PHLN1PHONEJACK1R20927KR25727KR2152KR2102KIC202B4558L27KR214C20922PSW201-1CHANNEL 1C21047/16R2015K1R2055K1C20110/25C20610/25IC201B4558LIC201A4558LC20447/16C20547/16VR201-1R202510R2034K3R206510R2074K3R204100R20

45、8100C20222PC20722PSW202CHANNES 2567R21633KR22033KC21310/25C21810/25IC203B4558LIC203A4558LC21647/16C21747/16VR202-1R2174K7R2214K7R218100R219100C21422PC22022PC20310/25C20810/25C21510/25C21910/25SW203CHANNEL 38910R22233KR22633KC22110/25C22610/25IC204B4558BIC204A4558LC22447/16C22547/16VR203-1R2234K7R227

46、4K7R224100R225100C22222PC22822PC22310/25C22710/25C21247/16C21147/16R211100R21310KR212100IC202A4558LR3013K6R3108K2R3021K5R3054K7R30730KR3031K5R30930KC301154C302154C305103C30322PR3062K4R30430KR3085K6VR302-150KEx2VR301-150KEx2VR303-150KEx2C304562IC301A4558L1k51KR3158K2R3233K6R3204K7R3192K4R3211K5R31630

47、KC316154C315154C312682C31422PR31830KR32230KR3175K6TREBLEBASSMIDDLEC313562IC301B4558LR311100R314100C310682C307682C30847/16C30947/16R31224KR31324KR3253K6R3348K2R3261K5R3294K7R33130KR3271K5R33330KC317154C318154C321682C31922PR3302K4R32830KR3325K6VR305-1 50KEx2VR304-150KEx2VR305-150KEx2C320562IC302A4558L

48、R3471K5R3398k2R3483K6R3444K7R34324KR3451K5R34030KC332154C331154C328682C33022PR34230KR34630KR3415K6TREBLEBASSMIDDELC329562IC302B4558LR336100R337100C326103C323103C32447/16C32547/16R33524KR33824kR3493K6R3588K2R3501K5R35330KR35530KR3511K5R35730KC333154C334154C337682C33522PR3542K4R3524K7R3565K6VR308-1 50

49、KEx2VR307-150KEx2VR309-1 50KEx2C336562IC303A4558LR3721K5R3638K2R3713K6R3684K7R3672K4R3701K5R36430KC348154C347154C344682C34622PR36630KR36930KR3655K6TREBLEBASSMIDDLEC345562IC303B4558LR360100R362100C340103C339103C34147/16C34247/16R35924KR36124KC34310/25C33810/25C32210/25C32710/25C30610/25C31110/25CHANN

50、EL 1LEVELVR311CHANNELCHANNELLEVEL-15V+15V+15V -15V-15V+15VGNDINPUTSELECTYCH1 GAINR258220K1234567812348567CH2 GAIN123456781234567VR310LEVELVR31212345678123456781234567823PH-1/LN1MASTER OUTPH-2PH-3LN-2LN-3REC OUTBOOTH OUTINPUTP C B MAINP C BCN1CN2CN3CN4CN5CN6CN7CN8CN9CN10CN11123456781234567850KBx2VR20